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Alright i found the fix for my problem. The problem was in the type of the file system that i used for the partition where i keep the SteamLibrary. Before i had two partitions on the external hard drive, one was HFS+ and other one was ExFAT. Because this ExFAT is visible as read/write on macs and read/write on Windows i decided to make on big partition on ExFAT. But today i found that this ExFAT does not support all mac ACL flags like for single user or multiple user access mode. So that's why i was getting all that IOExceptions in the log related to sharing violation. After formatting back to HFS+ the game works as expected. What was strange that when i was creating a profile or changing the settings of the game all this info was saved on the disk, that means a part of the code from the game is able to access the file system and perform regular IO operations, but some other code can't do that.

Yes it's on my external drive, all my games are there and working fine. KSP was there and use to work fine too. Before i had random issues like when you want to move your rocket to lunch pad and press the green button from far top right it was disabling all buttons and nothing more, staying like that forever. I have write and read permission on that drive, KSP is lunched under my user account and must have the same read and write privileges. @Claw i got your point no problem.

and what's strange this game use to work on this computer, i have like 400 plus hours played on it. and now after i removed everything and reinstalled it, it hung at that screen that i put at the beginning of the thread.

sorry about the player.log here is the right link and i am not dumb at that level not to know on what system i am currently running. i installed this game with Steam and if i go in it's folder i see there are mac executables. about the error IOException: Sharing violation on path i did a search on Google too, and it seams to occur when some application try to access a file that other application did not close it after reading or writing in it. and some of the results were related to Unity.

Also here is the current permission on the folder and files.

@Master Tao here is the info Model Name: iMac Model Identifier: iMac11,3 Processor Name: Intel Core i5 Processor Speed: 2.8 GHz Number of Processors: 1 Total Number of Cores: 4 L2 Cache (per Core): 256 KB L3 Cache: 8 MB Memory: 14 GB Processor Interconnect Speed: 4.8 GT/s ---------------------------------------------- Chipset Model: ATI Radeon HD 5750 Type: GPU Bus: PCIe PCIe Lane Width: x16 VRAM (Total): 1024 MB Vendor: ATI (0x1002) --------------------------------------- it's a clean install no mods. here is the KSP.log and here is the Player.log @Claw i will give it a try. what does it mean this IOException: Sharing violation on path /Volumes/Extended/Games/SteamLibrary/SteamApps/common/Kerbal Space Program/settings.cfg that it can't read/write to file ?

As soon i choose the carrier mode,a flag and give a name to the profile and press start button the game freezes and stays like that forever like in this picture. I am attaching the generated game log if it might give some clues, because i did not see anything that i could fix by myself. Click to see the log.